linux/include/net/sch_generic.h
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   1#ifndef __NET_SCHED_GENERIC_H
   2#define __NET_SCHED_GENERIC_H
   3
   4#include <linux/netdevice.h>
   5#include <linux/types.h>
   6#include <linux/rcupdate.h>
   7#include <linux/module.h>
   8#include <linux/pkt_sched.h>
   9#include <linux/pkt_cls.h>
  10#include <net/gen_stats.h>
  11#include <net/rtnetlink.h>
  12
  13struct Qdisc_ops;
  14struct qdisc_walker;
  15struct tcf_walker;
  16struct module;
  17
  18struct qdisc_rate_table
  19{
  20        struct tc_ratespec rate;
  21        u32             data[256];
  22        struct qdisc_rate_table *next;
  23        int             refcnt;
  24};
  25
  26enum qdisc_state_t
  27{
  28        __QDISC_STATE_RUNNING,
  29        __QDISC_STATE_SCHED,
  30        __QDISC_STATE_DEACTIVATED,
  31};
  32
  33struct qdisc_size_table {
  34        struct list_head        list;
  35        struct tc_sizespec      szopts;
  36        int                     refcnt;
  37        u16                     data[];
  38};
  39
  40struct Qdisc
  41{
  42        int                     (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
  43        struct sk_buff *        (*dequeue)(struct Qdisc *dev);
  44        unsigned                flags;
  45#define TCQ_F_BUILTIN   1
  46#define TCQ_F_THROTTLED 2
  47#define TCQ_F_INGRESS   4
  48        int                     padded;
  49        struct Qdisc_ops        *ops;
  50        struct qdisc_size_table *stab;
  51        u32                     handle;
  52        u32                     parent;
  53        atomic_t                refcnt;
  54        unsigned long           state;
  55        struct sk_buff          *gso_skb;
  56        struct sk_buff_head     requeue;
  57        struct sk_buff_head     q;
  58        struct netdev_queue     *dev_queue;
  59        struct Qdisc            *next_sched;
  60        struct list_head        list;
  61
  62        struct gnet_stats_basic bstats;
  63        struct gnet_stats_queue qstats;
  64        struct gnet_stats_rate_est      rate_est;
  65        int                     (*reshape_fail)(struct sk_buff *skb,
  66                                        struct Qdisc *q);
  67
  68        void                    *u32_node;
  69
  70        /* This field is deprecated, but it is still used by CBQ
  71         * and it will live until better solution will be invented.
  72         */
  73        struct Qdisc            *__parent;
  74};
  75
  76struct Qdisc_class_ops
  77{
  78        /* Child qdisc manipulation */
  79        int                     (*graft)(struct Qdisc *, unsigned long cl,
  80                                        struct Qdisc *, struct Qdisc **);
  81        struct Qdisc *          (*leaf)(struct Qdisc *, unsigned long cl);
  82        void                    (*qlen_notify)(struct Qdisc *, unsigned long);
  83
  84        /* Class manipulation routines */
  85        unsigned long           (*get)(struct Qdisc *, u32 classid);
  86        void                    (*put)(struct Qdisc *, unsigned long);
  87        int                     (*change)(struct Qdisc *, u32, u32,
  88                                        struct nlattr **, unsigned long *);
  89        int                     (*delete)(struct Qdisc *, unsigned long);
  90        void                    (*walk)(struct Qdisc *, struct qdisc_walker * arg);
  91
  92        /* Filter manipulation */
  93        struct tcf_proto **     (*tcf_chain)(struct Qdisc *, unsigned long);
  94        unsigned long           (*bind_tcf)(struct Qdisc *, unsigned long,
  95                                        u32 classid);
  96        void                    (*unbind_tcf)(struct Qdisc *, unsigned long);
  97
  98        /* rtnetlink specific */
  99        int                     (*dump)(struct Qdisc *, unsigned long,
 100                                        struct sk_buff *skb, struct tcmsg*);
 101        int                     (*dump_stats)(struct Qdisc *, unsigned long,
 102                                        struct gnet_dump *);
 103};
 104
 105struct Qdisc_ops
 106{
 107        struct Qdisc_ops        *next;
 108        const struct Qdisc_class_ops    *cl_ops;
 109        char                    id[IFNAMSIZ];
 110        int                     priv_size;
 111
 112        int                     (*enqueue)(struct sk_buff *, struct Qdisc *);
 113        struct sk_buff *        (*dequeue)(struct Qdisc *);
 114        int                     (*requeue)(struct sk_buff *, struct Qdisc *);
 115        unsigned int            (*drop)(struct Qdisc *);
 116
 117        int                     (*init)(struct Qdisc *, struct nlattr *arg);
 118        void                    (*reset)(struct Qdisc *);
 119        void                    (*destroy)(struct Qdisc *);
 120        int                     (*change)(struct Qdisc *, struct nlattr *arg);
 121
 122        int                     (*dump)(struct Qdisc *, struct sk_buff *);
 123        int                     (*dump_stats)(struct Qdisc *, struct gnet_dump *);
 124
 125        struct module           *owner;
 126};
 127
 128
 129struct tcf_result
 130{
 131        unsigned long   class;
 132        u32             classid;
 133};
 134
 135struct tcf_proto_ops
 136{
 137        struct tcf_proto_ops    *next;
 138        char                    kind[IFNAMSIZ];
 139
 140        int                     (*classify)(struct sk_buff*, struct tcf_proto*,
 141                                        struct tcf_result *);
 142        int                     (*init)(struct tcf_proto*);
 143        void                    (*destroy)(struct tcf_proto*);
 144
 145        unsigned long           (*get)(struct tcf_proto*, u32 handle);
 146        void                    (*put)(struct tcf_proto*, unsigned long);
 147        int                     (*change)(struct tcf_proto*, unsigned long,
 148                                        u32 handle, struct nlattr **,
 149                                        unsigned long *);
 150        int                     (*delete)(struct tcf_proto*, unsigned long);
 151        void                    (*walk)(struct tcf_proto*, struct tcf_walker *arg);
 152
 153        /* rtnetlink specific */
 154        int                     (*dump)(struct tcf_proto*, unsigned long,
 155                                        struct sk_buff *skb, struct tcmsg*);
 156
 157        struct module           *owner;
 158};
 159
 160struct tcf_proto
 161{
 162        /* Fast access part */
 163        struct tcf_proto        *next;
 164        void                    *root;
 165        int                     (*classify)(struct sk_buff*, struct tcf_proto*,
 166                                        struct tcf_result *);
 167        __be16                  protocol;
 168
 169        /* All the rest */
 170        u32                     prio;
 171        u32                     classid;
 172        struct Qdisc            *q;
 173        void                    *data;
 174        struct tcf_proto_ops    *ops;
 175};
 176
 177struct qdisc_skb_cb {
 178        unsigned int            pkt_len;
 179        char                    data[];
 180};
 181
 182static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
 183{
 184        return (struct qdisc_skb_cb *)skb->cb;
 185}
 186
 187static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
 188{
 189        return &qdisc->q.lock;
 190}
 191
 192static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
 193{
 194        return qdisc->dev_queue->qdisc;
 195}
 196
 197static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
 198{
 199        return qdisc->dev_queue->qdisc_sleeping;
 200}
 201
 202/* The qdisc root lock is a mechanism by which to top level
 203 * of a qdisc tree can be locked from any qdisc node in the
 204 * forest.  This allows changing the configuration of some
 205 * aspect of the qdisc tree while blocking out asynchronous
 206 * qdisc access in the packet processing paths.
 207 *
 208 * It is only legal to do this when the root will not change
 209 * on us.  Otherwise we'll potentially lock the wrong qdisc
 210 * root.  This is enforced by holding the RTNL semaphore, which
 211 * all users of this lock accessor must do.
 212 */
 213static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
 214{
 215        struct Qdisc *root = qdisc_root(qdisc);
 216
 217        ASSERT_RTNL();
 218        return qdisc_lock(root);
 219}
 220
 221static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
 222{
 223        struct Qdisc *root = qdisc_root_sleeping(qdisc);
 224
 225        ASSERT_RTNL();
 226        return qdisc_lock(root);
 227}
 228
 229static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
 230{
 231        return qdisc->dev_queue->dev;
 232}
 233
 234static inline void sch_tree_lock(struct Qdisc *q)
 235{
 236        spin_lock_bh(qdisc_root_sleeping_lock(q));
 237}
 238
 239static inline void sch_tree_unlock(struct Qdisc *q)
 240{
 241        spin_unlock_bh(qdisc_root_sleeping_lock(q));
 242}
 243
 244#define tcf_tree_lock(tp)       sch_tree_lock((tp)->q)
 245#define tcf_tree_unlock(tp)     sch_tree_unlock((tp)->q)
 246
 247extern struct Qdisc noop_qdisc;
 248extern struct Qdisc_ops noop_qdisc_ops;
 249
 250struct Qdisc_class_common
 251{
 252        u32                     classid;
 253        struct hlist_node       hnode;
 254};
 255
 256struct Qdisc_class_hash
 257{
 258        struct hlist_head       *hash;
 259        unsigned int            hashsize;
 260        unsigned int            hashmask;
 261        unsigned int            hashelems;
 262};
 263
 264static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
 265{
 266        id ^= id >> 8;
 267        id ^= id >> 4;
 268        return id & mask;
 269}
 270
 271static inline struct Qdisc_class_common *
 272qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
 273{
 274        struct Qdisc_class_common *cl;
 275        struct hlist_node *n;
 276        unsigned int h;
 277
 278        h = qdisc_class_hash(id, hash->hashmask);
 279        hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
 280                if (cl->classid == id)
 281                        return cl;
 282        }
 283        return NULL;
 284}
 285
 286extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
 287extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 288extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 289extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
 290extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
 291
 292extern void dev_init_scheduler(struct net_device *dev);
 293extern void dev_shutdown(struct net_device *dev);
 294extern void dev_activate(struct net_device *dev);
 295extern void dev_deactivate(struct net_device *dev);
 296extern void qdisc_reset(struct Qdisc *qdisc);
 297extern void qdisc_destroy(struct Qdisc *qdisc);
 298extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
 299extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 300                                 struct Qdisc_ops *ops);
 301extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
 302                                       struct netdev_queue *dev_queue,
 303                                       struct Qdisc_ops *ops, u32 parentid);
 304extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
 305                                   struct qdisc_size_table *stab);
 306extern void tcf_destroy(struct tcf_proto *tp);
 307extern void tcf_destroy_chain(struct tcf_proto **fl);
 308
 309/* Reset all TX qdiscs of a device.  */
 310static inline void qdisc_reset_all_tx(struct net_device *dev)
 311{
 312        unsigned int i;
 313        for (i = 0; i < dev->num_tx_queues; i++)
 314                qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
 315}
 316
 317/* Are all TX queues of the device empty?  */
 318static inline bool qdisc_all_tx_empty(const struct net_device *dev)
 319{
 320        unsigned int i;
 321        for (i = 0; i < dev->num_tx_queues; i++) {
 322                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 323                const struct Qdisc *q = txq->qdisc;
 324
 325                if (q->q.qlen)
 326                        return false;
 327        }
 328        return true;
 329}
 330
 331/* Are any of the TX qdiscs changing?  */
 332static inline bool qdisc_tx_changing(struct net_device *dev)
 333{
 334        unsigned int i;
 335        for (i = 0; i < dev->num_tx_queues; i++) {
 336                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 337                if (txq->qdisc != txq->qdisc_sleeping)
 338                        return true;
 339        }
 340        return false;
 341}
 342
 343/* Is the device using the noop qdisc on all queues?  */
 344static inline bool qdisc_tx_is_noop(const struct net_device *dev)
 345{
 346        unsigned int i;
 347        for (i = 0; i < dev->num_tx_queues; i++) {
 348                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 349                if (txq->qdisc != &noop_qdisc)
 350                        return false;
 351        }
 352        return true;
 353}
 354
 355static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
 356{
 357        return qdisc_skb_cb(skb)->pkt_len;
 358}
 359
 360/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
 361enum net_xmit_qdisc_t {
 362        __NET_XMIT_STOLEN = 0x00010000,
 363        __NET_XMIT_BYPASS = 0x00020000,
 364};
 365
 366#ifdef CONFIG_NET_CLS_ACT
 367#define net_xmit_drop_count(e)  ((e) & __NET_XMIT_STOLEN ? 0 : 1)
 368#else
 369#define net_xmit_drop_count(e)  (1)
 370#endif
 371
 372static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 373{
 374#ifdef CONFIG_NET_SCHED
 375        if (sch->stab)
 376                qdisc_calculate_pkt_len(skb, sch->stab);
 377#endif
 378        return sch->enqueue(skb, sch);
 379}
 380
 381static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
 382{
 383        qdisc_skb_cb(skb)->pkt_len = skb->len;
 384        return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
 385}
 386
 387static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
 388                                       struct sk_buff_head *list)
 389{
 390        __skb_queue_tail(list, skb);
 391        sch->qstats.backlog += qdisc_pkt_len(skb);
 392        sch->bstats.bytes += qdisc_pkt_len(skb);
 393        sch->bstats.packets++;
 394
 395        return NET_XMIT_SUCCESS;
 396}
 397
 398static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
 399{
 400        return __qdisc_enqueue_tail(skb, sch, &sch->q);
 401}
 402
 403static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
 404                                                   struct sk_buff_head *list)
 405{
 406        struct sk_buff *skb = __skb_dequeue(list);
 407
 408        if (likely(skb != NULL))
 409                sch->qstats.backlog -= qdisc_pkt_len(skb);
 410
 411        return skb;
 412}
 413
 414static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
 415{
 416        return __qdisc_dequeue_head(sch, &sch->q);
 417}
 418
 419static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
 420                                                   struct sk_buff_head *list)
 421{
 422        struct sk_buff *skb = __skb_dequeue_tail(list);
 423
 424        if (likely(skb != NULL))
 425                sch->qstats.backlog -= qdisc_pkt_len(skb);
 426
 427        return skb;
 428}
 429
 430static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
 431{
 432        return __qdisc_dequeue_tail(sch, &sch->q);
 433}
 434
 435static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
 436                                  struct sk_buff_head *list)
 437{
 438        __skb_queue_head(list, skb);
 439        sch->qstats.backlog += qdisc_pkt_len(skb);
 440        sch->qstats.requeues++;
 441
 442        return NET_XMIT_SUCCESS;
 443}
 444
 445static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
 446{
 447        return __qdisc_requeue(skb, sch, &sch->q);
 448}
 449
 450static inline void __qdisc_reset_queue(struct Qdisc *sch,
 451                                       struct sk_buff_head *list)
 452{
 453        /*
 454         * We do not know the backlog in bytes of this list, it
 455         * is up to the caller to correct it
 456         */
 457        __skb_queue_purge(list);
 458}
 459
 460static inline void qdisc_reset_queue(struct Qdisc *sch)
 461{
 462        __qdisc_reset_queue(sch, &sch->q);
 463        sch->qstats.backlog = 0;
 464}
 465
 466static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
 467                                              struct sk_buff_head *list)
 468{
 469        struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
 470
 471        if (likely(skb != NULL)) {
 472                unsigned int len = qdisc_pkt_len(skb);
 473                kfree_skb(skb);
 474                return len;
 475        }
 476
 477        return 0;
 478}
 479
 480static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
 481{
 482        return __qdisc_queue_drop(sch, &sch->q);
 483}
 484
 485static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
 486{
 487        kfree_skb(skb);
 488        sch->qstats.drops++;
 489
 490        return NET_XMIT_DROP;
 491}
 492
 493static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
 494{
 495        sch->qstats.drops++;
 496
 497#ifdef CONFIG_NET_CLS_ACT
 498        if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
 499                goto drop;
 500
 501        return NET_XMIT_SUCCESS;
 502
 503drop:
 504#endif
 505        kfree_skb(skb);
 506        return NET_XMIT_DROP;
 507}
 508
 509/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
 510   long it will take to send a packet given its size.
 511 */
 512static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
 513{
 514        int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
 515        if (slot < 0)
 516                slot = 0;
 517        slot >>= rtab->rate.cell_log;
 518        if (slot > 255)
 519                return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
 520        return rtab->data[slot];
 521}
 522
 523#ifdef CONFIG_NET_CLS_ACT
 524static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
 525{
 526        struct sk_buff *n = skb_clone(skb, gfp_mask);
 527
 528        if (n) {
 529                n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
 530                n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
 531                n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
 532        }
 533        return n;
 534}
 535#endif
 536
 537#endif
 538